Disclosure Rules Leave Some Relatives in the Dark

BRUSSELS—Tom Mortier received a message at work last year saying his 64-year-old mother had died the day before, and he quickly found out she'd been euthanized.

Mr. Mortier, who teaches college chemistry, was shocked. Though estranged from his mother, he knew she was depressed and had spoken of euthanasia. But he had no idea this could happen, he said, especially since she wasn't physically ill, and her children weren't informed....